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SubjectRe: [RFC PATCH 4/4] Directory listing support for union mounted directories.
On Wed, 2007-06-20 at 13:09 +0100, Christoph Hellwig wrote:
> On Wed, Jun 20, 2007 at 11:24:18AM +0530, Bharata B Rao wrote:
> > From: Bharata B Rao <>
> > Subject: Directory listing support for union mounted directories.
> >
> > Modifies readdir()/getdents() to support union mounted directories.
> >
> > This patch adds support to readdir()/getdents() to read directory entries
> > from all the directories of the union stack, and present a merged view to
> > the userspace. This is achieved by maintaining a cache of read entries.
> >
> > TODO: Breaks lseek on union mounted directories, Fix this.
> Btw, to avoid dealing with file structs representing multiple objects
> ->readdir should be changed to an inode_operation and not take a struct
> file * but rather struct inode + loff_t *ppos. This sounds like a nice
> preparatory patch for any kind of union mount implementation and is
> acceptable standing on it's own.

No it shouldn't. The struct file contains other stateful information
from the open() call (such as authentication info) that needs to be
passed into readdir.


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